978428649 has 8 divisors (see below), whose sum is σ = 1423168992. Its totient is φ = 592987040.

The previous prime is 978428611. The next prime is 978428663. The reversal of 978428649 is 946824879.

978428649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 978428649 - 2⁸ = 978428393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (978428699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14824644 + ... + 14824709.

It is an arithmetic number, because the mean of its divisors is an integer number (177896124).

Almost surely, 2^978428649 is an apocalyptic number.

It is an amenable number.

978428649 is a deficient number, since it is larger than the sum of its proper divisors (444740343).

978428649 is a wasteful number, since it uses less digits than its factorization.

978428649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29649367.

The product of its digits is 6967296, while the sum is 57.

The square root of 978428649 is about 31279.8441332434. The cubic root of 978428649 is about 992.7572184288.

It can be divided in two parts, 97842 and 8649, that added together give a triangular number (106491 = T₄₆₁).

The spelling of 978428649 in words is "nine hundred seventy-eight million, four hundred twenty-eight thousand, six hundred forty-nine".